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Electron densities for 10 planetary nebulae derived from the semiforbidden C III lambda 1907/1909 ratio. IIElectron densities for IC 351, IC 2165, J900, IC 3568, NGC 6644, NGC 6891, IC 4997, NGC 7009, Hu 1-2, and IC 5217 are derived from high-dispersion semiforbidden C III spectrograms. For seven of these nebulae, the derived electron density is larger than the values derived from either surface brightness measurements or forbidden line ratios. Only one object, Hu 1-2, shows pronounced splitting of the semiforbidden C III emission lines due to a large expansion velocity.
Document ID
19810055390
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1086/158975
Authors
Feibelman, W. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Boggess, A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mccracken, C. W. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hobbs, R. W. (NASA Goddard Space Flight Center Laboratory for Astronomy and Solar Physics, Greenbelt, MD, United States)
Date Acquired
August 11, 2013
Publication Date
June 15, 1981
Publication Information
Publication: Astrophysical Journal
Subject Category
Astronomy
Accession Number
81A39794
Distribution Limits
Public
Copyright
Other

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